Hydraulic hoist-lever construction



R. E. SMITH Sept. 11, 1934.

HYDRAULIC HOIST LEVER CONSTRUCTION Filed Oct. 1931 5 Sheets-Sheet l H EL7 Sept. 11, 1934.

R. E. SMITH 1,973,668

HYDRAULIC HOIST LEVER CONSTRUCTION Filed Oct. 9, 1951 3 Sheets-Sheet 2RALPH 5.5mm, 7

Awomuys R. E. SMITH 1,973,668

HYDRAULIC HOIST LEVER CONSTRUCTION Filed Oct. 9, 1951 5 Sheets-Sheet 3RALPH E.SMITH,

mm L

m wdi Sept. 11, 1934.

Patented Sept. ll, 1934 UNITED STATES HYDRAULIC HOIST-LEVER GalionMetallic Vault a corporation of Ohio Application October 9,

12 Claims.

This invention relates to improvements in hoists generally and moreparticularly to hoists adapted to be used in connection with dumpbodies. It is particularly the object of this invention to provide ahoist in which the application of power is along a straight line ofthrust and acts upon a system of levers for hoisting some objects amongwhich may be a dump body of a truck.

It is also an object of this invention to provide an elevatin mechanismcontained Within the supported frames forming a part of the structurewhich constitutes the support and also a part of the object to beelevated.

It is also an object of this invention to provide a straight line thrustwhich operates upon a system of levers whereby there is a compoundresult, consisting of simple lever action and a toggle action.

It is also the object of this invention to apply the lifting force to atruck body well in advance of the center of gravity of the body, whileat the same time, permitting the pivoting of the body at the rearthereof and at the rear of the side frame so as to permit of maximumvertical elevation of the body with the engaging of the frame, while atthe same time applying the lifting force in advance of the center ofgravity of the body.

These and other advantages will appear from the following descriptiontaken in connection with the drawings in which there is shown apreferred embodiment of the invention.

Fig. 1 is a side elevation of a truck frame with the dump body mountedthereon, showing in dot ted lines the dumping mechanism.

Fig. 2 is a longitudinally inverted section through part of the dumpbody and part of the supporting frame, showing the dumping mechanism.

Fig. 3 is a side elevation of the dump body in dumping position andshowing the mechanism for positioning the dump body in dumping position.

Fig. 4 is a top plan view with parts removed to show the dumpingmechanism.

Fig. 5 is a section on line 55 of Fig. 2.

Fig. 6 shows one end of the piston'rod shaft with the hook thereonengaging beneath part of the trackway su porting that end of the shaft.

In the present instance, the hydraulic hoist mechanism is shown usedinconnection with a dump truck, but this mechanism may be used for otherpurposes.

The numeral 1 is used to designate side bars of a frame supported on thetruck and forming 5 a part of a housing. for containing the dumpingCompany, Galion, Ohio,

1931, Serial No. 567,915

mechanism. These side bars are connected at each end by means of angleirons 2.

Supported on the side bars and the frame formed thereby is a dump body 3which has on each side and on the bottom thereof a side bar 1. Theseside bars with the side bars 1 form a complete housing and casing forthe dumping mechanism and conceal and protect the same when the body isin horizontal position as shown in Fig.1.

Iii-position as shown in Fig. 1, the dumping body rests on top of sidebars 1. Adjacent the rear end of thebody and attached to the side bars 4are brackets 5, one on each side. These brackets are V-shaped and haveat their lower ends holes through which a shaft 6 extends. This shaft issupported in the side bars 1 of the frame.

t each side of the frame below the shaft 6 and supported on the side bar1 and a bracket 1 is a shaft '7 which has attached adjacent its innerend thereoflone end of each of a pair of links 8. The other ends ofwhich are attached by means of a suitable pivot 9 to one end of a link10 and to one end of a link 12. The other end of the link 10 is pivotedbetween a pair of bars 4' at point 11. The bars 4' are attached to thebody frame between the side bars 4. The other end of link 12 is pivotedto one end of a shaft 13.

There are two sets of these two-lever mechanisms, one on each side ofthe body, and are similarly operated and both connected to the shaft 13so that whenever this shaft 13 moves, the lever mechanism is operated todump or lower the body.. On each end of shaft is a hook 13 engaging thetrackway to hold the roller thereon.

Adjacent each link 12, on its pivot shaft 13, is a roller 14 on theshaft: 13. In order to support these rollers, a trackway 15 is providedfor each roller. These trackways are slightly inclined downward towardthe front of the body and supported at each end by means of a cross beam16.

Each bracket 1 is supported at its lower end by shaft 7, while its upperendis welded to a trackway 15. The lower end of each bracket 1" isbraced by a beam 15 attached to one end of the shaft 7 at a bracket 1"while its other end is welded to a trackway.

For operating the shaft 13 and the link mechanisms, there is provided apiston rod 17, attached at one end to the central part of the shaft 13,while its other end extends into a cylinder 19 and hasthereon a piston'18 workthe piston rod and shaft 13.

ing within the cylinder. The cylinder is supported in an inclinedposition at one end by one of the beams 16 and at the other end by meansof a beam 20. The cylinder is so positioned that when the piston and thepiston rod moves thereon, they move in line with the trackways 15, withthe outer end of the piston rod 1'? supported on the trackways by meansof the shaft 13 and the rollers on the end thereof.

Adjacent the lower end of the cylinder is a valve casing 21 which hasthereon a Valve mechanism for controlling the admission of somehydraulic. means into and from the cylinder for .fh'e purposes ofoperating the piston and piston'rod.

From the valve casing, leading into the cylinder is an inlet 22. Thisinlet leads into the lower end of the cylinder, while there extends fromthe rear end or" the cylinder an outlet pipe 23. This outlet pipeextends from the rear end of the cylinder to the valve casing so thatwater or oil or any other material used for operating the piston mayescape from :the rear end back to the valve casing.

There is provided in the piston a passageway adapted to be closed bymeans of a valve 24 which has a stem 25 extending through the opening.In order to hold this valve 24 normally closed, there is provided aspring 26 around the stem and between the piston and the suitable stockmember cnthe end of the valve stem. There is also provided a dumpinggage stop 27.

A pump such as is indicated by the numeral 28 may be used for applyinghydraulic pressure to the cylinder for operating the piston and pistonrod therein.

In Fig. 1, the dump body is shown in horizontal position supported ontop .of the truck frame which may be considered a support. In order tocause the body to be hoisted for dumping purposes, a liquid of some kindis forced. into. the lower end of the cylinder against the piston .sothat the piston is advanced toward the upper end of the cylinder,carrying with it This causes the links 12 to move toward the rear,thereby bringing the links 8 and 10 more nearly in line with each otherand elevating at the same time these links from a position such as shownin Figs. 1

\ and 2 to a position shown in Fig. 3.

This action of the piston 1'7 on the links 12 has both a simple leveraction and also a toggl'e action. It is to be observed that the shaftfor operating the links 12 always moves in a single plane so that thereis a direct application of power along one line.

I desire to comprehend within my invention such modifications as may beembraced within my claims and the scope of my invention.

Having thus fully described my invention, what I claim is new and desireto secure by Letters Patent, is: l

1. In a hoist, in combination with a supporting member and object to behoisted, a system of links attached to the supporting member and to theobject to be hoisted, a trackway on. the supporting member, and means tooperate the links to elevate said object, said means including acylinder, a piston and piston rod, and rollers on the piston rodengaging the trackway and guided thereby. 1 I

2. In a hoist, in combination with. the supporting member and an objectto be hoisted, a pair of links attached to each other and to thesupporting member and the object-tobe-hoisted and means connected to thelinks where they are attached to each other and movable in a linesubstantially parallel to the links attached to the supporting memberwhen the links are in non-hoisting positions to operate the levers toelevate'the object to be hoisted.

3. In a hoist, in combination with a supporting member and an object tobe hoisted, a pair of links pivoted to each other at one end and havingtheir other ends attached to the supporting member and the object to behoisted, respectively, a link connected at one end to one of said links,means engaging the other end of said link for operating said link andstationary means to. guide the last named means in a straight linesubstantially parallel to the first lever when the body is innon-dumping position.

4. In a hoist, in combination with a supporting member and an object tobe hoisted, a pair of links pivoted to each other at one end and havingthe other end of one linkattached to the supporting member and the.other end of the other link attached tothe object to be hoisted, a linkattached at one end to said links, a roller on the other end of the lastmentioned link, a stationary guide for said roller and means to causesaid roller to travel along said guide whereby the links are operatedand the object to be hoisted is elevated.

5. In a hoist, in combination with the supporting member and an objectto be hoisted, pivoted to said supporting member, a pair of linkspivoted at one endto each other and having the other end of one linkpivoted to the supporting member and the other end of the other linkpivoted to the object to be supported, a stationary trackway, atraveling member on said trackway, means connecting said links to saidtraveling member and means to cause said travelingmember to move on thetrackway whereby thelinks are operated and the object hoisted,

6. Ina hoist in combination with a supporting member and. an object tobe hoisted, a system of links attached to the supporting member and tothe object to be hoisted, a trackway, and means movable along thetrackway to operate the links to; elevate said object, said meansincluding a shaft having rollers engaging the trackway and linksconnected to the firstmentioned links.

7-. In a dump body, in combination with a support-ing frame to which oneend ofthe dump body is pivoted, a link pivoted at one end to said frame,asecond link pivoted at one end to 3 a link on each side of the framepivoted at one 1 0 end to the frame, a second link on each side of thedump body pivoted at one end to the dump body, means pivotally connectedto the ends of said links and a link attached at one gaging the otherend. of the last-named link to cause it to travel in a straight linesubstantially-parallel; tothe first link when; the body is'inJnon-dumDin position, whereby. the links are operated .andithe' bodydumped.

end to said last-named means, and means en- 1A5 9. In a hoistingapparatus, a supporting frame, a body, a pair of links on each side ofthe frame, one end of each link of one pair of links attached to oneside of the frame and one end of each of the links of the other pair oflinks being attached to the other side of the frame, a single linkattached at one end to each side of the body, the other ends of eachsingle link being attached to the free ends of one pair of links, andmeans acting in a plane substantially parallel to the pairs of linkswhen the body is in non-dumping position to operate all of said links.

10. In a hoisting apparatus, a supporting frame, a body, a pair of linkson each side of the frame, one end of each link of one pair of linksbeing attached to one side of the frame and one end of each of the linksof the other pair of links being attached to the other side of theframe, a single link on each side of the body attached at one end to thebody, pivots by which the other ends of all the links are connected, atrackway on the frame, and means movable on the track- Way connected tothe pivots for operating the links to hoist the body.

11. In a hoisting apparatus, a supporting frame, a body, a pair of linkson each side of the frame,

one end of each link of one pair of links being attached to one side ofthe frame and one end of each of the links of the other pair of linksbeing attached to the other side of the frame, a single link on eachside of the body attached at one end to the body, pivots by which theother ends of all the links are connected, a trackway on the frame, andmeans movable on the trackway connected to the pivots for operating thelinks to hoist the body, said means including a shaft having rollersengaging the trackway.

12. In a hoisting apparatus, a supporting frame, a body, a pair of linkson each side of the frame, one end of each link of one pair of linksbeing attached to one side or" the frame and one end of each of thelinks of the other pair of links being attached to the other side of theframe, a link on each side of the body attached at one end to the body,pivots by which the other ends oi. all the links are connected, atrackway on the frame, a shaft having rollers on said trackway, linksconnecting said shaft and pivots, and means to move said shaft androllers along the track- Way to operate the links, whereby the body ishoisted.

RALPH E. SMITH.

